Composition for tempering steel.



TRUMAN A. HOUSER, OF DORRANGETON, PENNSYLVANIA.

COMPOSITION FOR TEMPERZNG STEEL.

No Drawing.

T all whom it may concern Be it known that I, TRUMAN A. HOUSER,

' a citizen of the United States, residing at freely Dorranceton, in thecount-y of Luzerne and State of Pennsylvania, have invented certain newand useful Improvements in Compositions for Temperingfiteel, of whichthe following is a specification.

My invention relates to the method of tempering steel and thecomposition of matter used in said method and has for itsprincipal-.object the provision of a method by which steel may be madeharder and tougher at a lower heat than by the methods now in use andfurthermore, to provide means by which, the tempered steel will notcheck or crack and will not scale after being treated.

In the practice of my invention, I employ a composition of mattercomprising the following ingredients in the proportions named, viz:cyanid of potassium 4 ounces, sal-ammoniac 3 ounces, borax 3 ounces,saltpeter 2 ounces, sal-soda 2 ounces, blue vitriol 2 ounces, table salt1 ounce, and rosin ounce.

These ingredients are powdered and theroughly mixed while in theirpowdered state.

In the practice of my method in treating carbon or tool steel I firstheat the steel to a. dark cherry red. I then apply the compoundhereabove described to the heated steel by sprinkling it thereon andreturn the steel to the fire until the compound flows over the steel.After this I dip the steel in water and draw the temper. I then try thetemper with a file and repeat the above operation until the temper issatistac tory. After the proper temper has been reached I cool the steelin water.

To harden taps, reamers, dies and the like, I apply the compositionabove described after heating the tool to a cherry red. The tool is thenreturned to the tire and heated until it is a dark cherry red. I thendraw a temper to the toughness desired, and cool in water.

It will be noted that one of the principal Specification of LettersPatent.

Application filer; Eovembcrfi,

?atented Mar, 18,1913.

rare. its. vessel.

advantages of this method is that carbon steel can be tempered at alower heat and made harder and tougher than by any other method, andfurthermore, that steel treated with this composition will not scale.

In using my improved composition for the treatment of alloy or highspeed steel, 1 first heat the part of the tool to be tempered to a highred heat.- I then cover the tool wit the composition and reheat the toolto as high a heat as possible without causing "it to melt. The tool isthen removed from the fire and brushed off and I then place it in a bathof fish oil keeping the tool in motion in the oil to prevent the oilfrom becoming heated immediately surrounding the tool. In place of oilif desired, the temper may be secured by submitting the tool to .astrong 7 65 blast of cooled air,

By this method oftreating highspeed 01'- alloy steel, it is apparentthat a lower heat than by the method in present use may be employed andat the same time the steel will be harder and tougher and furthermore,the steel will not check or crack and will not scale.

Having thus described my invention what- I claim is 1. A composition ofmatter for tempering steel, consisting of a certain quantity of cyanidof potassium and smaller quantities f borax, saltpeter, Sal-soda, bluevitriol,

table salt, and rosin.

2. A composition of matter for tempering steel consisting of cyanid ofpotassium 4: ounces, sal-ammoniac 3 ounces, boraX 3 ounces, saltpeter 2ounces, Sal-soda 2 ounces, blue vitriol 2 ounces, table salt 1 ounce,and rosin 1} ounce.

In testimony whereof I atlix my signature in presence of two witnesses.

Witnesses: BESS IiLLoYn,

WM. J. RUFF.

Copies oi. this patent may be obtained for five cents each, myafidressing the Gommissioner of intents, Washington, D. G.

